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Chemical weeding techniques in larch nursery
Larch is divided into Larix principis-rupprechtii and Larix gmelini. Larix principis-rupprechtii originates from Shanxi and Hebei; Larix gmelinii originates from Heilongjiang and northeast of Inner Mongolia. The chemical weeding methods adopted for this species are as follows: 1. Post-seeding seedlings after sowing. After the seeds are sown and covered with earth, an effective amount of 10 to 15 grams per 667 square meters, 40 kg of water, and evenly sprayed on the seedbed with a sprayer, can effectively control the seedlings. Annual single, dicotyledonous weeds. Second, the growth period treatment before sowing after sowing with Gore for soil treatment, the effective period of up to 1 to 2 months, May to June when weeds reappear (emergent), and then Goor per 667 square meters effective amount of 10 To 12 grams, add 40 kilograms of water and evenly spray on the bed, which can effectively control annual single and dicotyledonous weeds. If weeds appear again from July to August, use them in the same way. After the seedling has not been used before the emergence of fruit soil treatment, when the weeds appear on the bed, can be used Guerrilla effective amount of 10 grams per 667 square meters + efficient cover grass per 667 square meters of effective amount of 5 grams, add water, 40 kg, Evenly spraying on the bed can effectively control the annual single and dicotyledonous weeds, which is safe for seedlings. In early July, when the weeds present in the nursery are mainly grasses, they can use efficient grass cover, with an effective amount of 5 to 10 grams of water per 667 square meters and 40 kilograms of water, evenly sprayed on the surface of the bed, effectively controlling 1 year old grasses. Weeds, safe for seedlings. Third, pay attention to matters needing attention 1, post-planting seedlings, fruit dosage can be the upper limit of the dose; the first dose in the growth period can be the lower limit of the dose; the second dose is the upper limit of the dose. 2, do not disturb the soil after spraying, so as not to affect the weeding effect. 3. After spraying, the sprayer must be cleaned to prevent him from producing phytotoxicity on the crops.